In an open system matter and energy can be transferred ·
In a closed system only energy can be exchanged ·
In an isolated system neither matter nor energy can be exchanged · The cell has to be an open system because it needs to exchange matter and energy and the only way to do so is through an open system ·
As an open system the cell allows nutrients to enter the cell and waste products to exit the cell ·
The cell does this through the use of a semi-permeable membrane
The genotypes of the homozygous guardians utilized as a part of making the phenotypically wild F1 heterozygote is cl h +/cl h + and + sp/+ sp. I hope the answer will help you. For more questions, feel free to ask in Brainly.